The invention has simple devices and low operation cost, and has no potential safety hazard.
本发明方法设备简单，运行成本低，不存在安全隐患。
The process method has simple equipment, lower cost and has no potential safety hazard.
本发明方法设备简单，运行成本低，不存在安全隐患。
There exists large potential safety hazard when drivers work under the state of fatigue.
汽车驾驶员在疲劳状态下驾驶汽车存在着非常大的安全隐患。
There exists large potential safety hazard when drivers work under the state of fatigue.
汽车驾驶员在疲劳状态下驾驶汽车存在着非常大的安全隐患。
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